net positive projects - homes that make the world measurably better
DESCRIPTION
Are all 'green' building projects the same? Can we add floor area while also reducing GHGs? At Lanefab Design/Build we are wrestling with these questions... so here are our latest thoughts from the 'fabLab.TRANSCRIPT
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Net Positive Projects
Homes that make the world measurably better.
(v1.0, November 2013)
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LEED? Passive House? Living Building Challenge? Smart Growth? TOD? Net Zero?
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The real question, if you’re concerned about climate change is:
“Does your project contribute to a real and measurable reduction in your
region’s GHG emissions?”
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The real question, if you’re concerned about climate change is:
“Does your project contribute to a real and measurable reduction in your
region’s GHG emissions?”
Does it have a ‘Net Positive’ impact?
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How ‘good’ are your new buildings?
Code Minimum High Performance
Question 1:
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Code Minimum High Performance
Better
Lots of GHGsFrom heating,
hot water,and electricity
(example: Standard 2x6)
Fewer GHGsFrom heating,
hot water,and electricity
(example: Passive House)
How ‘good’ are your new buildings?
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Where are they located?
Oil-DependentLocation
(Walk Score < 45)
Typical Location (for the Region)
WalkableLocation
(Walk Score > 65)
Question 2:
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Oil-DependentLocation
(Walk Score < 45)
Typical Location (for the Region)
WalkableLocation
(Walk Score > 65)
Better
Lots of GHGsFor transporting
occupants
Fewer GHGsfor transporting
occupants
Where are they located?
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What do they replace?
Final question…
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Green Field(Natural Site)
Gray Field(Parking Lot)
Existing Building(s)
Better
What do they replace?
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Green Field(Natural Site)
Gray Field(Parking Lot)
Existing Building(s)
Better
Here’s your opportunity to have a positive
impact!
What do they replace?
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3. What do they replace?
2. Where are they located?
1. How ‘good’ are your new buildings?
The 3 Questions for Net Positive Projects:
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We’ve always found it funny that some of the ‘greenest’ homes are built on pristine fields, in
locations that you have to drive to.
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Yes, that’s green guru Amory Lovins’ house…
And, yes, we’ve designed and built similar projects…
We’ve always found it funny that some of the ‘greenest’ homes are built on pristine fields, in
locations that you have to drive to.
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Where is it located?
Better
Bet
ter
Co
de
Min
imu
m
Hig
hPe
rfo
rman
ce
Oil-Dependent Location
WalkableLocation
How good is your new building?
Performance+
Location= ?
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Where is it located?
Better
Bet
ter
Co
de
Min
imu
m
Hig
hPe
rfo
rman
ce
Oil-Dependent Location
WalkableLocation
How good is your new building? Code Min.
Building in an Oil-Dependent
Location
High PerformanceBuilding in an
Oil-Dependent Location
Code Min.Building in a
WalkableLocation
High PerformanceBuilding in a
WalkableLocation
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Where is it located?
Better
Bet
ter
Co
de
Min
imu
m
Hig
hPe
rfo
rman
ce
Oil-Dependent Location
WalkableLocation
How good is your new building? Code Min.
Building in an Oil-Dependent
Location
High PerformanceBuilding in an
Oil-Dependent Location
Code Min.Building in a
WalkableLocation
High PerformanceBuilding in a
WalkableLocation
BADDECENT
BETTER
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Let’s look at some residential development scenarios…
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Let’s look at some residential development scenarios…
Project 1:Renovating an older house
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“BEFORE”Annual GHG emissions from the site
“AFTER”Annual GHG emissions from the site
Project 1: Renovating / Weatherizing an existing home, in any location
?
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“BEFORE”Annual GHG emissions from the site
“AFTER”Annual GHG emissions from the site
Project 1: Renovating / Weatherizing an existing home, in any location
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“BEFORE”Annual GHG emissions from the site
“AFTER”Annual GHG emissions from the site
Net Positive!
Project 1: Renovating / Weatherizing an existing home, in any location
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“BEFORE”Annual GHG emissions from the site
“AFTER”Annual GHG emissions from the site
Net Positive!
Project 1: Renovating / Weatherizing an existing home, in any locationHow good? Code MinimumLocation? Any locationReplaces? An old, inefficient, building
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Project 1: Renovating / Weatherizing an existing home, in any locationHow good? Code MinimumLocation? Any locationReplaces? An old, inefficient, building
Net Positive!
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Project 2: Building a new house on a bare lot
(i.e. business as usual…)
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“BEFORE”Annual GHG emissions from the site
“AFTER”Annual GHG emissions from the site
Project 2: New home, on a natural site How good? Code MinimumLocation? Any locationReplaces? ‘Green Field’
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“BEFORE”Annual GHG emissions from the site
“AFTER”Annual GHG emissions from the site
Project 2a: New typical home, on a natural site How good? Code MinimumLocation? Any locationReplaces? ‘Green Field’
Increased GHG
emssions
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Project 2a: New typical home, on a natural site How good? Code MinimumLocation? Any locationReplaces? ‘Green Field’
Increased GHG
emssions
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Project 2b: Building a new ‘Passive House’* on a bare lot
(* a home so well insulated, and air tight, that it doesn’t need a furnace)
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“BEFORE”Annual GHG emissions from the site
“AFTER”Annual GHG emissions from the site
Project 2b: New Passive House, on a natural site How good? Code MinimumLocation? Any locationReplaces? ‘Green Field’
Much better, but still
increased GHG
emissions
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Project 2b: New Passive House, on a natural site How good? Code MinimumLocation? Any locationReplaces? ‘Green Field’
Much better, but still
increased GHG
emissions
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Project 2 - Thoughts: Building either a new ‘typical’ house, or a passive house, on a natural lot still results in an increase in GHGs. New green-field buildings have an additive impact.
So… what you replace is important.
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Project 3: Building a new house to replace an older one
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“BEFORE”Annual GHG emissions from the site
“AFTER”Annual GHG emissions from the site
Project 3a: New House, replacing an older home, in any locationHow good? Code MinimumLocation? Any locationReplaces? An old, inefficient, building of the same size
Net Positive!
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“BEFORE”Annual GHG emissions from the site
“AFTER”Annual GHG emissions from the site
Project 3b: New Passive House, Replacing an older home (in any location)How good? High PerformanceLocation? Any locationReplaces? An old, inefficient, building of the same size
Even more Net Positive!
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Project 3b: New Passive House, Replacing an older home (in any location)How good? High PerformanceLocation? Any locationReplaces? An old, inefficient, building of the same size
Even more Net Positive!
…if it replaces an older, inefficient home
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Project 3 - Thoughts: Building a new house to replace an older one…
…it’s much easier to be net-positive if you’re replacing or repairing an existing home.
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But what about the location?
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If we want to build net-positive projects, then we probably have to stop ignoring the impact of the location we choose.
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“BEFORE”Annual GHG emissions from the site
“AFTER”Annual GHG emissions from the site
Project 2a: New typical home, on a natural siteHow good? Code MinimumLocation? Any locationReplaces? ‘Green Field’
Increased GHG
emssions
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“BEFORE”Annual GHG emissions from the site
“AFTER”Annual GHG emissions from the site
Project 2a: New typical home, on a natural site >> in a rural/suburban locationHow good? Code MinimumLocation? Oil DependentReplaces? ‘Green Field’
(Even more) Increased
GHG emssions + Transport GHGs
(vs. other locations in the region)
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Project 2a: New typical home, on a natural site in a rural/suburban locationHow good? Code MinimumLocation? Oil DependentReplaces? ‘Green Field’
(Even more) Increased
GHG emssions
+ Transport GHGs(vs. other locations in the region)
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“BEFORE”Annual GHG emissions from the site
“AFTER”Annual GHG emissions from the site
Project 2a: New typical home, on a natural siteHow good? Code MinimumLocation? Any locationReplaces? ‘Green Field’
Increased GHG
emssions
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“BEFORE”Annual GHG emissions from the site
“AFTER”Annual GHG emissions from the site
Project 2a: New House, on a natural site >> in an urban/walkable locationHow good? Code MinimumLocation? WalkableReplaces? ‘Green Field’
Increased GHG
emssions(but not as
many)ReducedTransport GHGs(vs. other locations in the region)
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“BEFORE”Annual GHG emissions from the site
“AFTER”Annual GHG emissions from the site
Project 2b: New Passive House, on a natural site How good? Code MinimumLocation? Any locationReplaces? ‘Green Field’
Much better, but still
increased GHG
emissions
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“BEFORE”Annual GHG emissions from the site
“AFTER”Annual GHG emissions from the site
Project 2b: New Passive House, on a natural site >> in a rural/suburban location How good? Code MinimumLocation? Any locationReplaces? ‘Green Field’
Transport Increases
GHG emissions
+ Transport GHGs(vs. other locations in the region)
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“BEFORE”Annual GHG emissions from the site
“AFTER”Annual GHG emissions from the site
Project 2b: New Passive House on a natural site >> in a walkable neighbourhoodHow good? High PerformanceLocation? WalkableReplaces? ‘Green Field’
Net Positive? Reduced
Transport GHGs(vs. other locations in the region)
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Ok. But global populations are still growing (until 2070?) meaning we’ll probably need to build more floor area and more homes…
…in addition to renovating/replacing what we already have.
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Ok. But global populations are still growing (until 2070?) meaning we’ll probably need to build more floor area and more homes…
Can we add space and reduce GHGs?
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Project 4: Combining new construction and renovation
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“BEFORE”Annual GHG emissions from the site
“AFTER”Annual GHG emissions from the site
Project 4a: Renovating an Existing Building & Adding on a New BuildingHow good? Code MinimumLocation? Any LocationReplaces? Part of the floor area replaces an older building
Renovated Floor Area
New (Additional) Floor Area
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“BEFORE”Annual GHG emissions from the site
“AFTER”Annual GHG emissions from the site
Project 4b: Renovating an Existing Building & Adding a Passive House How good? High PerformanceLocation? Any LocationReplaces? Part of the floor area replaces an older building
Renovated Floor Area
New (Additional) Floor Area
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“BEFORE”Annual GHG emissions from the site
“AFTER”Annual GHG emissions from the site
NetPositive!
ReducedTransport GHGs(vs. other locations in the region)
SmarterGrowth!
Project 4b: Renovating an Existing Building & Adding a Passive House >> WalkableHow good? High PerformanceLocation? WalkableReplaces? Part of the floor area replaces an older building
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Project 4 Example:
23 Park PlacePassive House Renovation, New York
*(by Fabrica 718)
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Project 4 Example: 23 Park Place, New York NYHow good? High PerformanceLocation? WalkableReplaces? Part of the floor area replaces an older building
(project by Fabrica 718)
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Project 4 Example: 23 Park Place, New York NYHow good? High PerformanceLocation? WalkableReplaces? Part of the floor area replaces an older building
(project by Fabrica 718)
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Project 4 Example:
The Rose HousePassive House Renovation, Addition and Infill
*(a Lanefab project at the design stage…)
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Project 4 Example: Rose House, Vancouver BCHow good? High PerformanceLocation? WalkableReplaces? Part of the floor area replaces an older building
Existing mid-century home Renovation, Addition, & Infill
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Project 4 Example: Rose House, Vancouver BCHow good? High PerformanceLocation? WalkableReplaces? Part of the floor area replaces an older building
Existing mid-century home Renovation, Addition, & Infill
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“BEFORE”Annual GHG emissions from the site
“AFTER”Annual GHG emissions from the site
Goal: (2x) existing
floor area&
NetPositive Reduced
Transport GHGs(vs. other locations in the region)
Project 4 Example: Rose House, Vancouver BCHow good? High PerformanceLocation? WalkableReplaces? Part of the floor area replaces an older building
Renovation
Infill
Addition
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“BEFORE”Annual GHG emissions from the site
“AFTER”Annual GHG emissions from the site
Adding some ‘green bling’ could push it
further….
ReducedTransport GHGs(vs. other locations in the region)
Project 4 Example: Rose House, Vancouver BCHow good? High PerformanceLocation? WalkableReplaces? Part of the floor area replaces an older building
Reduced GHGs(through on-site renewable energy)
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Projects vs. Buildings:
- Start thinking about the performance of your Projects rather than just the performance of individual Buildings
- Projects can include combinations of renovations, replacements and new construction
What we’ve been thinking…
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Location Matters:
- A code minimum house, in a walkable location, can be as ‘good’* as a Passive House in a rural/suburban location
- Where we choose to locate our new buildings can have a big impact.
* (as far as the climate is concerned)
What we’ve been thinking…
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Fleet Efficiency:
• New buildings (even ‘green’ ones) have an additive impact
• We need to improve the efficiency of our total fleet of buildings (and not just focus on relative improvements to the new ones)
• As a designer/builder we have to look at the performance of our own cumulative fleet of projects. Is our ledger net positive or net negative?
What we’ve been thinking…
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Net Positive Projects:
- If we can combine renovations to older homes, with the construction of new, Passive House type homes, then we can add square footage while having a measurably net positive impact
What we’ve been thinking…
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What we’ve been thinking…
Net Positive Projects:
- If we absolutely have to build on a green-field site, or in an oil dependent location, then we’ll probably need to spend some money on ‘green bling’* to offset the impact of our choice of site and location.
* On site renewable power production (solar, wind, heat pump)
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E.57th Solar Laneway House
Dumfries St. Solar Laneway House